#$%^&*AU2012201965A120121025.pdf#####BUFFERING AGENT DELIVERY SYSTEM FOR ANESTHETIC SYRINGE ABSTRACT A syringe (10) for dispensing anesthetic from a cartridge (30) having an interior wall defining a hollow interior sized and shaped for receiving a dose of anesthetic, and a piston (42). The syringe (10) includes a tubular plunger (14) slidably received in the hollow interior of the tubular cartridge (12). The plunger (14) has a hollow interior extending between a distal end shaped for engaging the piston (42) and an open proximal end. The syringe (10) includes a plunger rod (54) slidably received in the hollow interior of the tubular plunger (14). The rod (54) has a sharp distal end (56) adapted to penetrate the piston (42), a proximal end (60), and a length extending between the distal end (56) and the proximal end (60) sized so a delivery portion of the rod (54) extends through the piston (42) into the cartridge (30) when the rod (54) is driven through the piston (42). The delivery portion includes a recess for receiving a buffering agent to reduce acidity of the dose of anesthetic. 6176742_ ILKM2/4 62 60 66 14 -54 72 74 76 50 -50 64 54 -52 13 30 70 --56 44 58 32 32 /-13 42 42- 3 300 -30 * JP 30 64 58 FIG. 2a FIG. 2b
